#!usr/bin/env python 

queue = [] 

def enQ():
	queue.append(raw_input(' Enter New string: ').strip())

def deQ():
	if len(queue) == 0:
		print 'Cannot pop from an empty queue!' 
	else:
		print 'Removed [', `queue.pop(0)`, ']'

def viewQ():
	print  queue

CMDs = {'e': enQ, 'd': deQ, 'v':viewQ}


def showmenu():
	pr="""
(E)nqueue 
(D)equeue
(V)iew
(Q)uit

Enter choice: """
	while True:
		while True:
			try:
				choice = raw_input(pr).strip()[0].lower()
			except (EOFError, KeyboardInterrupt, IndexError): 
				choice = 'q' 

			print '\nYou picked: [%s]' % choice 
			if choice not in 'devq':
				print 'Invalid option, tray again'
			else:
				break 

		if choice == 'q':
			break 
		CMDs[choice]()

if __name__ == '__main__':
	showmenu()
